RV-3029 Datasheet, PDF (16/67 Pages) MICORO CRYSTAL SWITZERLAND – DTCXO Temperature Compensated Real Time Clock

Micro Crystal
DTCXO Temperature Compensated Real Time Clock / Calendar Module
RV-3029
3.4. ALARM PAGE REGISTER FUNCTION
The Alarm Page registers contain alarm information. When one or more of these registers are loaded with a valid
second, minute, hour, day, weekday, month or year information and its corresponding alarm enable bit (AE_x) is
logic “1”, then that information will be compared with the current time / date information in the Watch Page
registers.
When all enabled comparisons first match (wired “AND”) and the AIE Flag (bit 0 in register Control_INT) is enabled,
then the AF Flag (bit 0 in register Control_INT) is set = “1” and an Interrupt signal becomes available at INT pin.
Disabled Alarm registers which have their corresponding bit AE_X at logic “0” are ignored.
3.4.1.SECONDS, MINUTES, HOURS, DAYS, WEEKDAYS, MONTHS, YEARS ALARM REGISTER
Alarm Seconds (address 10h…bits description)
Address
Function
Bit 7
Bit 6
10h
Second Alarm
AE_S
40
Bit 5
20
Bit 4
10
Bit 3
8
Bit 2
4
Bit 1
2
Bit 0
1
Bit
7
6 to 0
Symbol
AE_S
Seconds Alarm
Value
0
1
0 to 59
Description
Second Alarm is disabled
Second Alarm is enabled
These bits hold the Second Alarm information coded in BCD format
Alarm Minutes (address 11h…bits description)
Address
Function
Bit 7
Bit 6
11h
Minute Alarm
AE_M
40
Bit 5
20
Bit 4
10
Bit 3
8
Bit 2
4
Bit 1
2
Bit 0
1
Bit
7
6 to 0
Symbol
AE_M
Minutes Alarm
Value
0
1
0 to 59
Description
Minute Alarm is disabled
Minute Alarm is enabled
These bits hold the Minute Alarm information coded in BCD format
Alarm Hours (address 12h…bits description)
Address
Function
Bit 7
12h
Hours Alarm
AE_H
Bit 6
X
Bit 5
20-PM
Bit 4
10
Bit 3
8
Bit 2
4
Bit 1
2
Bit 0
1
Bit
Symbol
7
AE_H
6
X
12 hour mode (AM/PM)
5
20-PM
4 to 0
24 hour mode
5 to 0
Hours Alarm
Hours Alarm
Value
0
1
-
Hour Alarm is disabled
Hour Alarm is enabled
Unused
Description
0
1
1 to 12
Indicates AM
Indicates PM
These registers hold the Hours Alarm information coded in BCD format
when in 12 hour mode
0 to 23
These registers hold the Hours Alarm information coded in BCD format
when in 24 hour mode
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